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    <script>
        console.log(1 + 1);// 2
        console.log(1 - 1);// 0
        console.log(1 * 1);// 1
        console.log(1 / 1);// 1
        // 1. % 取余 (取模)
        console.log(4 % 2);// 0
        console.log(5 % 3);// 2
        console.log(3 % 5);// 3
        // 2.浮点数 算数运算里面会有问题
        console.log(0.1 + 0.2);//0.30000000000000004
        console.log(0.07 * 100); //7.00000000001
        // 3.我们不能直接拿着浮点数来进行相比较 是否相等
        var num = 0.1 + 0.2;
        console.log(num == 0.3);//flase
    </script>
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